Library Description

The library covers all the necessary functions to control Index Counter click board. The library contains a function that shows the status of the pins - direction and speed.

Key functions:

• uint8_t indexcounter_get_dir ( void ) - Get state of the direction pin function.
• uint8_t indexcounter_get_speed ( void ) - Get state of the speed pin function.

Examples description

The application is composed of three sections :

• System Initialization - Initializes GPIO, sets DIR ( AN ) and SPD ( RST ) pins as input and begins to write a log.
• Application Initialization - Initialization driver enables - GPIO, performs a control of the timer counter ( resolution of 1ms ) and sets the value of the timer counter, starting timer and number of pairs of rotating poles, also write log.
• Application Task - (code snippet) This is an example which demonstrates the use of the Index Counter click board. This example shows the direction of movement, Rotations Per Minute ( RPM or speed ) of the three pairs of rotating poles positioned in the sensor operating range. Results are being sent to the Usart Terminal where you can track their changes.

void application_task ( )
{
    speed_state = indexcounter_get_speed( );
    dir_state = indexcounter_get_dir( );

    if ( enable_speed && speed_state )
    {
        pulse_ms = time_cnt - start_timer;
        start_timer = time_cnt;
        speed_rpm = INDEXCOUNTER_ONE_MIN_CONV_MS / ( pulse_ms * n_pole_pairs );
        enable_speed = INDEXCOUNTER_SPEED_DISABLE;

        log_display ( speed_rpm );
    }

    if ( ( !enable_speed ) && ( !speed_state ) )
    {
        enable_speed = INDEXCOUNTER_SPEED_ENABLE;
    }
}

• void log_display ( float rpm_val ) - The function displays all results and a float value with a comma with two decimal places.

Other mikroE Libraries used in the example:

• GPIO
• UART

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 click or RS232 click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.